1/ f noise through the metal–nonmetal transition in percolating composites
We have measured the 1/f noise through the metal–nonmetal transition in carbon black/polymer composites as a function of temperature and doping. At the electronic transition, the resistivity power spectrum Sρ varies as Sρ∼ρQ, with Q=2.77, in agreement with classical three-dimensional percolation. At...
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Veröffentlicht in: | Applied physics letters 2000-01, Vol.76 (5), p.592-594 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | We have measured the 1/f noise through the metal–nonmetal transition in carbon black/polymer composites as a function of temperature and doping. At the electronic transition, the resistivity power spectrum Sρ varies as Sρ∼ρQ, with Q=2.77, in agreement with classical three-dimensional percolation. At lower temperatures, a crossover to tunneling-dominated transport occurs with Sρ∼ln Sρ/ρ2. Our results show that 1/f noise can be a more sensitive technique than resistivity itself for probing transport behavior near a percolation-induced electronic transition. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.125827 |